A formidable problem (e.g., the file is encrypted with a password that only a dead person knew).
For a short story, try to finish the first draft quickly to capture the "discovery process" without overthinking plot holes [5].
You might use the Snowflake Method , starting with a single sentence about the ZIP file and expanding it into a paragraph, then a full scene list [9]. 3. Draft and Refine
A unique element that separates it from other stories [4]. 2. Build the Framework